The one that looks like Daiki is his cousin, Taichi's brother. The difference is his hair is down. The one that look like Min Joon, Daiki's lover, is his second brother, to tell the difference is he had shorter hair and taller than minjoon, his name is Hyeok. The other one with black hair and slanted eyes that sit besides Hyeok is Minjoon's first brother. I forgot his name. The one with line in his face and slanted eyes and haired up is Sho, Daiki's uncle. The bald one is called Ren, Daiki personal bodyguard. There are also the tan big guy who are always wearing glasses, that's Minjoon and Toma's personal bodyguard. That is also the guy who is always wearing glasses, he is more or so Toma teacher but now like a babysitter, his name is Kenta.
heres my updated family tree
https://mangatoto.net/aok/xfs/attachs/3071b8944020c1b27b53e61a444d20f6396c9ddd_1130_516_101442.jpeg
Too many guys with the same freaking hair color. Idk who any is anymore because everyone either has brown or black hair and they all look alike. I give up. If it's not Daiki, his lover (can't remember his name), or Toma, then idk who they are